Patent US2800833A successfully refreshed from Google Patents.
US2800833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic enlarger apparatus
Assignee: Charles Beseler Co
•
Filing: 1954-09-01
•
Granted: 1957-07-30
•
Expires: 1974-09-01
Abstract
No abstract record available.
Inventors
- 👤 Jack J Kuscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:32
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/56
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE399408C
Cited
US1606955A
Cited
US1724866A
Cited
US1787662A
Cited
US1758240A
Cited
US1977453A
Cited
US2090270A
Cited
US2344558A
Cited
US2346490A
Cited
US2492898A
Cited
FI25898A
Cited
US2655334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |